Question

我有以下课程：

from forwind.lidarapi.api import MCLidarGUIPlugin


class MCLidarActions( Handler ):

    tcp_send = Event

    def object__updated_changed( self, info ):
        print info;
        pass;   

    def _tcp_send_changed( self ):
        print( "Click" )

和

from forwind.lidarapi.actions.api import MCLidarActions

class MCUDPActions( MCLidarActions ):

    def object__updated_changed( self, info ):
        pass;   

    def _tcp_send_changed( self ):
        print( "Click UDP" )

当我点击MCLidarActions中的按钮时，将调用_tcp_send_changed函数，如何扩展此函数，我也想在MCUDPActions中执行操作。在这种情况下，如果我点击该按钮，它将打印出click，但我还打印出Click UDP

Answer 1

以下是调用super（）的示例请注意，为了使超级工作，你需要继承对象。

class E(object):
    def __init__(self):
        print "enter E"
        print "leave E"

class F(E):
    def __init__(self):
        print "enter F"
        super(F, self).__init__()
        print "leave F"

f = F()

Answer 2

如果我理解你的问题，你可以这样做：

class MCLidarActions( object ):
    li = []

    tcp_send = 'Event'

    def object__updated_changed( self, info ):
        print info;
        pass;

    def _tcp_send_changed( self ):
        print( "Click" )
        for x in self.li:
            x._tcp_send_changed()


class MCUDPActions( MCLidarActions ):
    def __init__(self):
        self.li.append(self)
    def object__updated_changed( self, info ):
        pass;
    def _tcp_send_changed( self ):
        print( "Click UDP" )


class MC_uuuuuuuuuuuuuutp_Actions( MCLidarActions ):
    def __init__(self):
        self.li.append(self)
    def object__updated_changed( self, info ):
        pass;
    def _tcp_send_changed( self ):
        print( "Click _uuuuuuuuuuuuuutp_" )



M = MCLidarActions()
print 'M, instance of MCLidarActions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()


a = MCUDPActions()
print '\na, instance of MCUDPActions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()
print
print '  executing  a._tcp_send_changed():'
a._tcp_send_changed()


b = MCUDPActions()
print '\nb, instance of MCUDPActions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()
print
print '  executing  a._tcp_send_changed():'
a._tcp_send_changed()
print
print '  executing  b._tcp_send_changed():'
b._tcp_send_changed()


v = MC_uuuuuuuuuuuuuutp_Actions()
print '\nv, instance of MC_uuuuuuuuuuuuuutp_Actions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()
print
print '  executing  a._tcp_send_changed():'
a._tcp_send_changed()
print
print '  executing  b._tcp_send_changed():'
b._tcp_send_changed()
print
print '  executing  v._tcp_send_changed():'
v._tcp_send_changed()

结果

M, instance of MCLidarActions, created ------------
  executing  M._tcp_send_changed():
Click

a, instance of MCUDPActions, created ------------
  executing  M._tcp_send_changed():
Click
Click UDP

  executing  a._tcp_send_changed():
Click UDP

b, instance of MCUDPActions, created ------------
  executing  M._tcp_send_changed():
Click
Click UDP
Click UDP

  executing  a._tcp_send_changed():
Click UDP

  executing  b._tcp_send_changed():
Click UDP

v, instance of MC_uuuuuuuuuuuuuutp_Actions, created ------------
  executing  M._tcp_send_changed():
Click
Click UDP
Click UDP
Click _uuuuuuuuuuuuuutp_

  executing  a._tcp_send_changed():
Click UDP

  executing  b._tcp_send_changed():
Click UDP

  executing  v._tcp_send_changed():
Click _uuuuuuuuuuuuuutp_

但是在上面的代码中，有必要在基类的每个子类 MCUDPActions 和 MC_uuuuuuuuuuuuut_Actions 中定义一个函数 __ init __ MCLidarActions

为避免这种情况， li 中的追加可以放在基类中：

class MCLidarActions( object ): li = [] tcp_send = 'Event' def __init__(self): if self.__class__ != MCLidarActions: self.li.append(self) def object__updated_changed( self, info ): print info; pass; def _tcp_send_changed( self ): print( "Click" ) for x in self.li: x._tcp_send_changed() class MCUDPActions( MCLidarActions ): def object__updated_changed( self, info ): pass; def _tcp_send_changed( self ): print( "Click UDP" ) class MC_uuuuuuuuuuuuuutp_Actions( MCLidarActions ): def object__updated_changed( self, info ): pass; def _tcp_send_changed( self ): print( "Click _uuuuuuuuuuuuuutp_" )

，结果完全一样。

Python函数调用

2 个答案: